Crank-plate for bolster-springs.



PATENTED MAY 24, 1904.

G. B. FREEMAN. CRANK PLATE FOR BOLSTER SPRINGS.

APPLIOATION FILED JUNE 9, 1902.

1 1T0 MODEL.

UNITED STATES Patented May 24, 1904.

PATENT OFFICE.

CRANK-PLATE FOR BOLSTER-SPRINGS- SPECIFICATION forming part of LettersPatent No. 760,977, dated May 24, 1904.

Application filed June 9, 1902. Serial No. 110,727. (No model.)

To all whom it may concern.-

Be it known that I; GEORGE E. FREEMAN, a citizen of the United States,and a resident of Racine, in the county of Racine and State ofWisconsin, have invented certain new and useful Improvements inCrank-Plates for Bolster- Springs; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to crank-plates for bolster-springs; and itconsists in certain peculiarities of construction and combination ofparts, as will be fully set forth hereinafter in connection with theaccompanying drawings and subsequently claimed.

In the said drawings, Figure 1 is an under side plan view of my improveddevice. Fig. '2 is a longitudinal vertical sectional view of the same,taken on the plane indicated by the line 2 2in Fig. l; and Fig. 3 is atransverse vertical sectional view of the same, taken on the planeindicated by the line 3 3 of Fig. 1.

My invention is an improvement on the device shown in the patent granted.October 23, 1883, to John Smith, numbered 287,335, and is designed toobviate the defects of the same while retaining all the valuablefeatures, and to that end my device is so constructed as to avoid theobjection of weakness and the liability to the accumulation of dust andforeign substances, which impaired the usefulness of the Smith device.

Referring to the drawings, a represents my crank-plate, which issubstantially flat on both its under and upper surfaces, except that itis formed on its upper surface with the trans verse integral hollowsocket 5, open at each end, and there strengthened by the semicir-'cular exterior end flanges 0 0, the plate having an opening d on theunder side communicating with the interior of the said socket'b, for thepurposes hereinafter set forth. This socket b is adjacent to one end ofthe plate a, and the latter, beyond this point, is bifurcated, as shown,to form a pair of fingers e c, which are designed to embrace betweenthem one of the ordinary bolster-standards in the ordinary ceive theends of the bolster-springs of any ordinary construction, as is wellknown in the art.

The described socket 6, being Wholly closed except at the ends, excludesdust, dirt, and the like, as well as rain, snow, and moisture, and isvery strong and durable, affording a "complete bearing for the centralportion of the crank g, the same being bent at one end only and insertedthrough the socket while in a red-hot condition, and then the other endof the crank is properly bent, a suitable stay or stop being passedthrough the opening d in the plate a and held against the crank duringthis operation, so that while the end of the crank is being bent thecentral portion is prevented from being forced out of line, and by beingthus kept straight all danger of binding or excessive frictional contactof the cralk Within the socket in after use is obviate Having thusdescribed my invention, what Iclaim as new, and desire to secure byLetters Patent, is

1. A crank-plate for bolster-springs, comprising a substantially flatplate formed with an integral transverse open-ended socket on the uppersurface there0f, the said plate having an opening. through its underside communicating with the bore of the socket, the latter beingotherwise entirely closed, in combination with a double crank whosecentral portion is rotatable within said socket.

2. A crank-plate for bolster-springs, comprising a flat plate formedwith an integral open ended substantially cylindrical socket on theupper surface thereof, the said plate being bifurcated at one end toform fingers, the county of Milwaukee and State of l/Visand having abevel walled opening through eonsin, 1n the presence of two Witnesses.its under side, in l1ne With the space between said fingers, and communieating With the cen- GEORGE FREEMAN 5 ter of said socket. Witnesses:In testimony that I claim the foregoing I N. E. OLIPHANT,

have hereunto set my hand, at Milwaukee, in I ROLOFF.

